8 R. Takahaahi 



first iustar, but are hairy in the second and the following instars. 



In some Hormaphidina, the cornicles are absent in the first instar, appearing, 

 however, with the first moult. In the first iustar of Greenidea, tliey are very 

 peculiar in structure, being conical iu shape, not imbricated and without hairs, and 

 are merely tubercles in shape, but witli tlie first moult they become elongate and 

 liairy. In Cervaphis, Grcenidca and T'n'chosijihonajjhis, they are provided with 

 hairs even in the nymphs, excepting in tlie first instars of tlie two former genera. 

 These hairs of the winged adults of TrichosipJininiphis arc not capitate unlike tliose 

 of the nymphs. 



T\\c Cauda is usually shorten-, stouter and less hairy than iu the adults, more 

 especially so iu tlio younger nymphs, and is never constricted at the base or at 

 midlength. It is often wider than long, but is sometimes as long as wide in the 

 grown nymphs of some Aphidina and is longer than wide in the fourtii instar of 

 Macrof/'pIiicvK When seen from above, it is almost triangular in shape, with the 

 apex rounded, or the hind margin may be broadly rounded, sometimes being almost 

 semicinular iu outline. In Mi/zocaUi<i and some other genera of Callipterina, 

 throughout all tlic nymphal instars, it is destitute of hairs, witli the hind margin 

 broadly rounded. 



The anal plate is very simple, never Inlobed and usually not sinuous, but in 

 Greenidea it is somewhat sinuous even in tlic first instar. In Aldcaia it is not well 

 developed in the nymphs. 



The genital opening is not visible in tlie nymphs. 



The spiracles are similar to those of the adults in number and distribution, 

 sometimes slighly protuberant. 



The hairs on the body and its appendages are usually fewer in number in the 

 young nymphs than in the grown ones and adults. In some species of PeripliyUua, 

 tlie dimorphs are provided with very peculiar hairs or "lamellae" The nymphs 

 of the winged form of Chromaph/'s carpinicola Takah. are furnished with many 

 bristles, these being stouter and longer than those of the adults. 



In some BluzocaUis, My&us, NeopJiorodon. Trichosiphonaphls and C'apito- 

 pJiovKs, the nymphs of both the apterous or winged forms are furnished with many 

 capitate hairs as in the wingless adults, while the winged adults lack these hairs and are 

 provided with normal ones. In some species the wax-pores are as well developed even 

 in the first instar of tlie winged and wingless forms as in the wingless adults. They 

 are present iu tlie winged adults of Slivaphia diti Das, but not in tliose of Horm- 



